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#include "stdio_impl.h" #define MIN(a,b) ((a)<(b) ? (a) : (b)) char *fgets(char *s, int n, FILE *f) { char *p = s; unsigned char *z; size_t k; int c; if (n--<=1) { if (n) return 0; *s = 0; return s; } FLOCK(f); while (n) { z = memchr(f->rpos, '\n', f->rend - f->rpos); k = z ? z - f->rpos + 1 : f->rend - f->rpos; k = MIN(k, n); memcpy(p, f->rpos, k); f->rpos += k; p += k; n -= k; if (z || !n) break; if ((c = getc_unlocked(f)) < 0) { if (p==s || !feof(f)) s = 0; break; } n--; if ((*p++ = c) == '\n') break; } *p = 0; FUNLOCK(f); return s; } weak_alias(fgets, fgets_unlocked); |